I'm 24 6'2" 165 lbs, looking to gain mass obviously

I have worked out in the past, but always end up quitting after around 6 months and losing all the muscle I've gained. This time I am determined to stick with it forever. Been doing this workout for about 2 months, seems to be going well so far.

Monday - Biceps/forearms
Tuesday - Chest/triceps
Wednesday - Legs
Thursday - Shoulders/back
Friday - Biceps/forearms

Sat & Sun I rest.

What do you guys think, my biceps need the most work which is why I work them twice a week. They also take a lot more work to get them sore than any other body part. I think this is enough rest for them in between workouts they are never still sore when I work them again.